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WO2009113094A2 - Multilayer flexible sheet and method thereof - Google Patents

Multilayer flexible sheet and method thereof Download PDF

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Publication number
WO2009113094A2
WO2009113094A2 PCT/IN2009/000059 IN2009000059W WO2009113094A2 WO 2009113094 A2 WO2009113094 A2 WO 2009113094A2 IN 2009000059 W IN2009000059 W IN 2009000059W WO 2009113094 A2 WO2009113094 A2 WO 2009113094A2
Authority
WO
WIPO (PCT)
Prior art keywords
film
holographic
multilayer
adhesive
side layer
Prior art date
Application number
PCT/IN2009/000059
Other languages
French (fr)
Other versions
WO2009113094A3 (en
WO2009113094A4 (en
Inventor
Mrinal Kanti Banerjee
Original Assignee
Essel Propack Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Essel Propack Ltd. filed Critical Essel Propack Ltd.
Priority to CN2009901000976U priority Critical patent/CN202003147U/en
Publication of WO2009113094A2 publication Critical patent/WO2009113094A2/en
Publication of WO2009113094A3 publication Critical patent/WO2009113094A3/en
Publication of WO2009113094A4 publication Critical patent/WO2009113094A4/en

Links

Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
    • G03H1/02—Details of features involved during the holographic process; Replication of holograms without interference recording
    • G03H1/0236—Form or shape of the hologram when not registered to the substrate, e.g. trimming the hologram to alphanumerical shape
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
    • G03H1/0005—Adaptation of holography to specific applications
    • G03H1/0011—Adaptation of holography to specific applications for security or authentication
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
    • G03H1/02—Details of features involved during the holographic process; Replication of holograms without interference recording
    • G03H1/0252—Laminate comprising a hologram layer
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
    • G03H1/02—Details of features involved during the holographic process; Replication of holograms without interference recording
    • G03H1/024—Hologram nature or properties
    • G03H1/0244—Surface relief holograms
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
    • G03H1/02—Details of features involved during the holographic process; Replication of holograms without interference recording
    • G03H1/0276—Replicating a master hologram without interference recording
    • G03H1/028—Replicating a master hologram without interference recording by embossing
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H2250/00—Laminate comprising a hologram layer
    • G03H2250/10—Laminate comprising a hologram layer arranged to be transferred onto a carrier body
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H2250/00—Laminate comprising a hologram layer
    • G03H2250/35—Adhesive layer

Definitions

  • the invention relates to method for transferring holographic design on a multilayer film, a method for manufacturing holographic multilayer sheet, and the holographic multilayer sheet thereof.
  • Holographic films including metallized layers are known in the art and are utilized for a wide variety of applications.
  • these metallized films have good oxygen and moisture barrier properties.
  • the holographic sheets are manufactured by laminating holographic film of the PET (Poly Ethylene Terephthalate) or BOPP (Biaxially Oriented PolyPropylene).
  • PET Poly Ethylene Terephthalate
  • BOPP Biaxially Oriented PolyPropylene
  • presently available holographic films have very low interlayer bonding strength against PET or BOPP interface, which may result into separation of the laminate layer from the metallized interface of the holographic multilayer sheet.
  • PET or BOPP is considered as contamination in all Polyethylene multilayer tube laminate structure.
  • An objective of the invention is to provide a method for transferring a holographic design on a multilayer polyethylene film having DSC (Differential Scanning Calorimeter) melting point less than or equal to 119 degrees centigrade.
  • DSC Different Scanning Calorimeter
  • Another objective of the invention is to provide a method for transferring a holographic design on a multilayer polyethylene film so that the holographic film has higher interlayer bond strength.
  • Yet another objective of the invention is to provide a method for transferring a holographic design enabling surface printing on the other side layer of the multilayer of the holographic film.
  • Yet another objective of the invention is to provide a method for manufacturing holographic multilayer sheet.
  • Yet another objective of the invention is to provide holographic films, which have good oxygen and moisture barrier properties.
  • the present invention provides a method for transferring a holographic design on a multilayer polyethylene film having DSC (Differential Scanning Calorimeter) melting point less than or equal to 119 degrees centigrade.
  • the method comprises the steps of: embossing a holographic design over a PET (Poly Ethylene Terephthalate) or BOPP (Biaxially Oriented Poly • Propylene) film; metalizing the holographic design of the said film; preparing a multilayer having one side layer (herein after referred to as inner- side layer) with high metal affinity; applying adhesive in specific patterns over the surface of said inner side layer of the said multilayer film; adhering and curing holographic surface of the film over the adhesive applied surface of the multilayer film; and separating PET c, SOPP film from the cured film wherein inner side layer in combination with adhesive firmly bond holographic portion.
  • DSC Densanning Calorimeter
  • the invention enables high interlayer bond strength and transferring of holographic design from the PET or BOPP film to the multilayer film.
  • the invention further enables surface printing on the other side layer of the multilayer of the holographic film.
  • FIG. 1 is a flow chart depicting the method for transferring a holographic design, in accordance with an embodiment of the invention.
  • FiG. 2 illustrates a few predetermined definite patterns of adhesive application, in accordance with an embodiment.
  • Various embodiments of the present invention provide a method for transferring a holographic design on a multilayer polyethylene film having DSC (Differential Scanning Calorimeter) melting point less than or equal to 119 degrees centigrade.
  • DSC Different Scanning Calorimeter
  • Figure 1 is a flowchart depicting the method for transferring a holographic design on a multilayer polyethylene film having DSC melting point less than or equal to 119 degrees centigrade.
  • a holographic design is embossed over a PET or BOPP film.
  • the holographic design of the said film is metaliied.
  • a multilayer having one side layer herein after referred to as inner-side layer
  • adhesive is applied over the surface of said inner side layer of the said multilayer film in a predetermined pattern.
  • holographic surface of the film is adhered and cured over the adhesive applied surface of the multilayer film.
  • PET or BOPP film is separated from the cured film wherein inner side layer in combination with adhesive firmly bond with the holographic portion enabling transfer of holographic design from the PET or BOPP film to the multilayer film.
  • curing in step 110 is carried out for a duration of about 24 to 72 hours, preferably 48 hrs and at a temperature of about 35 to 50 0 C, preferably 45 0 C.
  • the multilayer sheet is produced by co-extrusion blown process and has a haze value of less than or equal to 15 and thickness between 40 micron to 100 micron. It may be apparent to a person skilled in the art that the other side layer of the multilayer is suitable for surface printing with high bond strength.
  • the inner layer of the multilayer having high metal affinity is a co-polymer of ethylene such as Ethylene Acrylic Acid with an acid percentage value from five to ten.
  • the adhesive at step 108 is applied in a predetermined definite pattern on the inner layer of the outer multilayer in such a manner that adhesive layer has numerous fine clear spots and channels where adhesive is absent. These clear spots are utilized for anchoring extruded molten polymers such as low-den .ity polyethylene, hnear low-density polyethylene, ethylene acrylic acid and th ⁇ like.
  • the predetermined definite pattern include applying the adhesive in dots, lines, dotted lines, cross lines and the like.
  • Figure 2 illustrates a few predetermined definite patterns.
  • the adhesive used at step 108 has a composition of two parts poly ⁇ rethane, two parts polyester, two parts epoxy, all heat curable or photopolymer based acrylic ultraviolet curable adhesive.
  • the invention provides a method of manufacturing holographic multilayer sheet comprising steps of laminating holographic side of the multilayer manufactured by the method cf the first embodiment with a barrier layer and extruding with extrusion polymer and sealant layer to form a holographic multilayer sheet.
  • the barrier layer may be an aluminum foil or multilayer film having three to nine layers including barrier polymer such as EVOH (Ethylene Vinyl Alcohol), nylon, polyethyleneterephthalate and the like at the core and other layers made of polyolefin or its copolymer.
  • the holographic multilayer sheet manufactured by the method of the present invention is suitable for manufacturing tubes used for various applications including foods, dentifrice, cosmetics, pharmaceuticals and the like.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Laminated Bodies (AREA)
  • Decoration By Transfer Pictures (AREA)

Abstract

A method for transferring a holographic design on a multilayer polyethylene film having DSC (Differential Scanning Calorimeter) melting point less than or equal to 119 degrees centigrade is provided. The holographic film has higher interlayer bond strength against PET (polyethyleneterephthalate) or BOPP (Biaxially oriented polypropylene) enabling surface printing on the other side layer of the multilayer of the holographic film. The films have good oxygen and moisture barrier properties and therefore can be used be used for manufacturing attractive holographic tubes for food product, toothpaste, cosmetics etc.

Description

MULTILAYER FLEXIBLE SHEET AND METHOD THEREOF.
TECHNICAL FIELD OF THE INVENTION
The invention relates to method for transferring holographic design on a multilayer film, a method for manufacturing holographic multilayer sheet, and the holographic multilayer sheet thereof.
BACKGROUND OF THE INVENTION
Holographic films including metallized layers are known in the art and are utilized for a wide variety of applications. For example, flexible packaging substrates for food products, gift wrapping paper, as a decorative component in non-flexible packages or rigid packages in tubes of toothpaste, cereal boxes, detergent boxes, and the like. For many applications, and in particular in the packaging of food products, it is desirable that these metallized films have good oxygen and moisture barrier properties. Presently, the holographic sheets are manufactured by laminating holographic film of the PET (Poly Ethylene Terephthalate) or BOPP (Biaxially Oriented PolyPropylene). However, presently available holographic films have very low interlayer bonding strength against PET or BOPP interface, which may result into separation of the laminate layer from the metallized interface of the holographic multilayer sheet.
Moreover, PET or BOPP is considered as contamination in all Polyethylene multilayer tube laminate structure.
Therefore, there is need for a process that will create holographic design on pure polyethylene film and then bond the holographic, film excellently with the laminated sheets to be used for manufacturing attractive holographic tubes for food product, toothpaste, cosmetics etc. SUMMARY OF THE INVENTION
An objective of the invention is to provide a method for transferring a holographic design on a multilayer polyethylene film having DSC (Differential Scanning Calorimeter) melting point less than or equal to 119 degrees centigrade.
Another objective of the invention is to provide a method for transferring a holographic design on a multilayer polyethylene film so that the holographic film has higher interlayer bond strength.
Yet another objective of the invention is to provide a method for transferring a holographic design enabling surface printing on the other side layer of the multilayer of the holographic film.
Yet another objective of the invention is to provide a method for manufacturing holographic multilayer sheet.
Yet another objective of the invention is to provide holographic films, which have good oxygen and moisture barrier properties.
Accordingly, the present invention provides a method for transferring a holographic design on a multilayer polyethylene film having DSC (Differential Scanning Calorimeter) melting point less than or equal to 119 degrees centigrade. The method comprises the steps of: embossing a holographic design over a PET (Poly Ethylene Terephthalate) or BOPP (Biaxially Oriented Poly • Propylene) film; metalizing the holographic design of the said film; preparing a multilayer having one side layer (herein after referred to as inner- side layer) with high metal affinity; applying adhesive in specific patterns over the surface of said inner side layer of the said multilayer film; adhering and curing holographic surface of the film over the adhesive applied surface of the multilayer film; and separating PET c, SOPP film from the cured film wherein inner side layer in combination with adhesive firmly bond holographic portion.
Therefore the invention enables high interlayer bond strength and transferring of holographic design from the PET or BOPP film to the multilayer film. The invention further enables surface printing on the other side layer of the multilayer of the holographic film.
Brief Description of the Drawings
So that the manner in which the above recited features of the present invention can be understood in detail, a more particular description of the invention, briefly summarized above, may be had by reference to various embodiments, some of which are illustrated in the appended drawings. It is to be noted, however, that the appended drawings illustrate only typical embodiments of -this invention and are therefore not to be considered limiting of its scope, for the invention may admit to other equally effective embodiments.
FIG. 1 is a flow chart depicting the method for transferring a holographic design, in accordance with an embodiment of the invention.
FiG. 2 illustrates a few predetermined definite patterns of adhesive application, in accordance with an embodiment.
DESCRIPTION OF THE INVENTION
Various embodiments of the present invention provide a method for transferring a holographic design on a multilayer polyethylene film having DSC (Differential Scanning Calorimeter) melting point less than or equal to 119 degrees centigrade.
Figure 1 is a flowchart depicting the method for transferring a holographic design on a multilayer polyethylene film having DSC melting point less than or equal to 119 degrees centigrade. In accordance with an embodiment of the invention, at step 102, a holographic design is embossed over a PET or BOPP film. At step 104, the holographic design of the said film is metaliied. At step 106, a multilayer having one side layer (herein after referred to as inner-side layer) with high metal affinity is prepared. At step 108, adhesive is applied over the surface of said inner side layer of the said multilayer film in a predetermined pattern. At step 110, holographic surface of the film is adhered and cured over the adhesive applied surface of the multilayer film. At step 112, PET or BOPP film is separated from the cured film wherein inner side layer in combination with adhesive firmly bond with the holographic portion enabling transfer of holographic design from the PET or BOPP film to the multilayer film.
In accordance with an embodiment of the invention, curing in step 110 is carried out for a duration of about 24 to 72 hours, preferably 48 hrs and at a temperature of about 35 to 50 0C, preferably 450C.
In accordance with an embodiment of the invention, the multilayer sheet is produced by co-extrusion blown process and has a haze value of less than or equal to 15 and thickness between 40 micron to 100 micron. It may be apparent to a person skilled in the art that the other side layer of the multilayer is suitable for surface printing with high bond strength.
In accordance with an embodiment of the invention, the inner layer of the multilayer having high metal affinity is a co-polymer of ethylene such as Ethylene Acrylic Acid with an acid percentage value from five to ten.
In accordance with an embodiment of the invention, the adhesive at step 108 is applied in a predetermined definite pattern on the inner layer of the outer multilayer in such a manner that adhesive layer has numerous fine clear spots and channels where adhesive is absent. These clear spots are utilized for anchoring extruded molten polymers such as low-den .ity polyethylene, hnear low-density polyethylene, ethylene acrylic acid and th Ϊ like. Examples of the predetermined definite pattern include applying the adhesive in dots, lines, dotted lines, cross lines and the like. Figure 2 illustrates a few predetermined definite patterns.
In accordance with an embodiment of the invention, the adhesive used at step 108 has a composition of two parts polyυrethane, two parts polyester, two parts epoxy, all heat curable or photopolymer based acrylic ultraviolet curable adhesive.
v In another embodiment, the invention provides a method of manufacturing holographic multilayer sheet comprising steps of laminating holographic side of the multilayer manufactured by the method cf the first embodiment with a barrier layer and extruding with extrusion polymer and sealant layer to form a holographic multilayer sheet. The barrier layer may be an aluminum foil or multilayer film having three to nine layers including barrier polymer such as EVOH (Ethylene Vinyl Alcohol), nylon, polyethyleneterephthalate and the like at the core and other layers made of polyolefin or its copolymer.
The holographic multilayer sheet manufactured by the method of the present invention is suitable for manufacturing tubes used for various applications including foods, dentifrice, cosmetics, pharmaceuticals and the like.
It will readily be appreciated by those skilled in the art that the present invention is not limited to the specific embodiments herein shown. Thus variations may be made within the scope and spirit of the accompanying claims without sacrificing the principal advantages of the invention.

Claims

1 A method for transferring a holographic design on a multilayer -film, the method comprising:
a. embossing the holographic design over a film;
b. metalizing the holographic design of the said film;
c. preparing a multilayer film having a inner side layer with high metal affinity;
d. applying adhesive over the surface of the inner side layer of the said multilayer film , wherein the adhesive is applied in a predetermined pattern; and
e. adhering and curing holographic surface of the film over the adhesive applied surface of the multilayer film.
2. The method according to claim 1 , wherein a multilayer sheet is produced by co-extrusion blown process, the multilayer sheet having a haze value of less than equal to fifteen and thickness between forty and one hundred micron.
3. The method according to claim i further comprising the step of separating the film from the cured film, the inner side layer in combination with adhesive firmly bonding with the holographic portion.
4. The method according to claim 1 , wherein the multilayer polyethylene film has a DSC (Differential Scanning Calorimeter) melting point less than or equal to 119 degree centigrade.
5. The method according to claim 1 , wherein the design is embossed over a PET (Poly Ethylene Terephthalate) or BOPP (BIAXIALLY ORIENTED POLY PROPYLENE) film.
6. The method according to claim 1 , wherein the step of curing is carried out for a duration of 24 to 72 hours.
7. The method according to claim 1 , wherein the step of curing is carried out at a temperature between 35 to 500C.
8. The method according to claim 1 , wherein the application of adhesive over the surface of the inner side layer of the said multilayer film in a predetermined pattern includes applying adhesive at some parts over the surface of the inner side layer depending upon the predetermined pattern.
PCT/IN2009/000059 2008-01-22 2009-01-22 Multilayer flexible sheet and method thereof WO2009113094A2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN2009901000976U CN202003147U (en) 2008-01-22 2009-01-22 Holographic multilayered slice

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IN152/MUM/2008 2008-01-22
IN152MU2008 2008-01-22

Publications (3)

Publication Number Publication Date
WO2009113094A2 true WO2009113094A2 (en) 2009-09-17
WO2009113094A3 WO2009113094A3 (en) 2009-11-05
WO2009113094A4 WO2009113094A4 (en) 2010-01-07

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IN2009/000059 WO2009113094A2 (en) 2008-01-22 2009-01-22 Multilayer flexible sheet and method thereof

Country Status (2)

Country Link
CN (1) CN202003147U (en)
WO (1) WO2009113094A2 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8551614B2 (en) 2009-12-29 2013-10-08 International Paper Company Three-layer wrapping and a process for manufacturing a packaging using the same
EP3045307A1 (en) * 2014-09-12 2016-07-20 Andrews & Wykeham Limited Laminated credential
WO2018061029A1 (en) * 2016-09-28 2018-04-05 Huhtamaki-Ppl Limited Packaging laminate
WO2018061031A1 (en) * 2016-09-28 2018-04-05 Huhtamaki-Ppl Limited A mono-layer sheet and a laminate therefrom

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0201323A2 (en) * 1985-05-07 1986-11-12 Dai Nippon Insatsu Kabushiki Kaisha Article incorporating a transparent hologramm
EP0497555A1 (en) * 1991-01-28 1992-08-05 Dai Nippon Printing Co., Ltd. Patterned reflective transfer foils and their use as recording materials
US6544369B1 (en) * 1999-12-28 2003-04-08 Japan Tobacco Inc. Process for producing thin film-like material having decorative surface

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0201323A2 (en) * 1985-05-07 1986-11-12 Dai Nippon Insatsu Kabushiki Kaisha Article incorporating a transparent hologramm
EP0497555A1 (en) * 1991-01-28 1992-08-05 Dai Nippon Printing Co., Ltd. Patterned reflective transfer foils and their use as recording materials
US6544369B1 (en) * 1999-12-28 2003-04-08 Japan Tobacco Inc. Process for producing thin film-like material having decorative surface

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8551614B2 (en) 2009-12-29 2013-10-08 International Paper Company Three-layer wrapping and a process for manufacturing a packaging using the same
EP3045307A1 (en) * 2014-09-12 2016-07-20 Andrews & Wykeham Limited Laminated credential
WO2018061029A1 (en) * 2016-09-28 2018-04-05 Huhtamaki-Ppl Limited Packaging laminate
WO2018061031A1 (en) * 2016-09-28 2018-04-05 Huhtamaki-Ppl Limited A mono-layer sheet and a laminate therefrom

Also Published As

Publication number Publication date
CN202003147U (en) 2011-10-05
WO2009113094A3 (en) 2009-11-05
WO2009113094A4 (en) 2010-01-07

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